Will light up the LED for sure.
Regards,
NKN
>From: "Vipul Mathur" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: <[EMAIL PROTECTED]>
>CC: <[EMAIL PROTECTED]>, "Ajit Ranade" <[EMAIL PROTECTED]>
>Subject: Re: [linux-delhi] temperature
>Date: Tue, 9 May 2000 14:33:43 +0530
>
>Well here is how you can implement the LED indicator being talked about
>here:
>(ascii art follows)
>
>+V (Red Wire) o--------+-------------------------------o
> | ..
> +--/\/\/\/----->|-----+
>From Motherboard Resistor LED | TO CPU FAN
> R |
> |
>GND (Black Wire) o---------------------------+---------o
>
>
>Now the value of the resistor can be derived as:
>
>R = (V - 1.5) / (25 * 10^(-3))
>
>V is the voltage being supplied to the CPU fan, wither 12v or 8v
>
>For most LEDs 1.5v is the voltage drop across the LED when it is lit-up.
>And
>the current throught the LED is 25*10^(-3) A = 25mA for maximum birghtness.
>
>For V=12v, the value of R = 420 ohms
>For V=5v, the value of R = 140 ohms
>
>Any nearby value of the resistor may be used. Be careful about the polarity
>of the LED as it won't work if connected the wrong way. In the diagram the
>end with the | is the -ve terminal (usually marked by a shorter lead).
>
>HTH
>
> Cheerio!
> ,_,
> (O,O) Vipul Mathur <[EMAIL PROTECTED]>
> ( ) http://www.crosswinds.net/~vipul/
>+---"-"------------------------------------------------------------------+
>| 'The most exciting phrase to hear in science, the one that heralds new |
>| discoveries, is not "Eureka!" but "Hmm. That's funny..."'-Isaac Asimov |
>+------------------------------------------------------------------------+
> A good programmer makes all the right mistakes
>
>
>Durga Prasad Allada <[EMAIL PROTECTED]> wrote:
> > Soldering an LED is a goiod idea and it will not drain much current nor
> > effect the Fan performance.BUt must make sure the power to Fan is driven
> > by AC or DC..and if DC is it at 12 V or 5 Vand select a
> > right LED matching this power input..
> > - durga
> >
> > Raju Mathur wrote:
> > > Solder an LED there yourself :-)
> > >
> > > Warning: I don't know if this will affect the fan speed.
> > >
> > > >>>>> "Ajit" == Ajit Ranade <[EMAIL PROTECTED]> writes:
> > >
> > > Ajit> raju-
> > >
> > > Ajit> i did check the bios, and it has a setting for turning off
> > > Ajit> the cpu fan during "suspend" state. but otherwise there was
> > > Ajit> nothing about sensing whether cpu fan is on or
> > > Ajit> not. shouldn't oem's put a led or something, or will that
> > > Ajit> consume too much power, relative to its utility.
>
>
>
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